tools: avoid global install of dmn for lint update

When updating ESLint, use npx to run dmn rather than installing dmn
globally.

PR-URL: #21744
Reviewed-By: Roman Reiss <me@silverwind.io>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

tools/update-eslint.sh

@@ -2,7 +2,7 @@
 
 # Shell script to update ESLint in the source tree to the latest release.
 
-# Depends on npm and node being in $PATH.
+# Depends on npm, npx, and node being in $PATH.
 
 # This script must be be in the tools directory when it runs because it uses
 # $BASH_SOURCE[0] to determine directories to work in.
@@ -19,11 +19,8 @@ cd node_modules/eslint
 npm install --no-bin-links --production --no-package-lock eslint-plugin-markdown@next
 cd ../..
 
-# Install dmn if it is not in path.
-type -P dmn || npm install -g dmn
-
 # Use dmn to remove some unneeded files.
-dmn -f clean
+npx dmn -f clean
 
 cd ..
 mv eslint-tmp/node_modules/eslint node_modules/eslint